Overall there are 21 different frequencies the recorder can tune into given sufficient time, and who knows?

在充足的时间里记录仪总共能收听21个不同的频率，谁知道呢？

youdao

Overall there are 21 different frequencies the recorder can tune into given sufficient time, and who knows?

在充足的时间里记录仪总共能收听21个不同的频率，谁知道呢？

youdao